first adc champion to buy?

let's start with this: i hate adc, if it's me who's playing adc or playing with adcs i hate this role so much. but i wanna start learning it, my worst role XD. so, i've decided i'll practice it and start playing it. idk what champs to buy, i want someone who can be like in normal difficulty so it won't be a piece of cake but not so hard that i'll have to learn him more then i learn the role. i was thinking about someone like draven, just because he seems nice. anyway, pls tell me what should i consider and why and pls no broken champs, thx {{champion:222}}
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